cp's OEIS Frontend

A208031 Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 0 1 vertically.

%I A208031 #7 Jul 22 2025 21:07:31
%S A208031 19,361,1995,17119,123709,955073,7184755,54606513,413322903,
%T A208031 3133722193,23742848381,179940784609,1363558911785,10333337050839,
%U A208031 78306467535059,593415477442647,4496952127639277,34078343213807171,258248804284088975
%N A208031 Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 0 1 vertically.
%C A208031 Row 6 of A208028
%H A208031 R. H. Hardin, <a href="/A208031/b208031.txt">Table of n, a(n) for n = 1..210</a>
%F A208031 Empirical: a(n) = 5*a(n-1) +30*a(n-2) -64*a(n-3) -157*a(n-4) +303*a(n-5) +101*a(n-6) -262*a(n-7) -23*a(n-8) +64*a(n-9) -4*a(n-11)
%e A208031 Some solutions for n=4
%e A208031 ..0..1..0..1....1..0..1..1....1..1..1..0....1..0..1..1....0..1..0..1
%e A208031 ..1..0..1..1....1..0..1..1....0..1..1..1....0..1..1..1....0..1..0..0
%e A208031 ..1..0..1..1....1..1..0..1....0..1..0..0....0..1..1..0....1..0..1..0
%e A208031 ..0..1..1..0....0..1..0..1....1..1..0..0....1..1..0..0....1..0..1..1
%e A208031 ..0..1..0..0....0..1..1..1....1..0..1..1....1..1..0..1....0..1..1..0
%e A208031 ..1..1..0..1....1..0..1..1....1..0..1..0....1..0..1..0....0..1..0..0
%K A208031 nonn
%O A208031 1,1
%A A208031 _R. H. Hardin_ Feb 22 2012